US4104550A - Motor seals - Google Patents

Motor seals Download PDF

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Publication number
US4104550A
US4104550A US05/747,064 US74706476A US4104550A US 4104550 A US4104550 A US 4104550A US 74706476 A US74706476 A US 74706476A US 4104550 A US4104550 A US 4104550A
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United States
Prior art keywords
cavity
housing
diameter
frusto
conical portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/747,064
Inventor
Herbert F. Penhorwood
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Magnetek Inc
Original Assignee
Universal Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Universal Electric Co filed Critical Universal Electric Co
Priority to US05/747,064 priority Critical patent/US4104550A/en
Application granted granted Critical
Publication of US4104550A publication Critical patent/US4104550A/en
Assigned to UNIVERSAL ELECTRIC HOLDING COMPANY reassignment UNIVERSAL ELECTRIC HOLDING COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNIVERSAL ELECTRIC COMPANY
Assigned to UNIVERSAL ELECTRIC COMPANY reassignment UNIVERSAL ELECTRIC COMPANY MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE JULY 31, 1981. (DELAWARE) Assignors: UNIVERSAL ELECTRIC COMPANY
Assigned to MAGNETEK, INC., A CORP OF DE. reassignment MAGNETEK, INC., A CORP OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNIVERSAL ELECTRIC COMPANY, A CORP OF DE.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/30—Sealing
    • H01B17/303—Sealing of leads to lead-through insulators
    • H01B17/308—Sealing of leads to lead-through insulators by compressing packing material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas

Definitions

  • This invention relates to submersible motors and particularly to seals for submersible motors.
  • the present invention is intended to eliminate the aforementioned disadvantages by using unique and simple means for effecting a suitable seal where it is required to bring the motor leads from an oil filled cavity into an adjacent cavity for making electrical connections.
  • FIG. 1 is a part sectional elevational view of a submersible pump embodying the invention.
  • FIG. 2 is a fragmentary sectional exploded view on an enlarged scale of a portion of the motor in FIG. 1.
  • FIG. 3 is a fragmentary sectional view on an enlarged scale of the portion of the motor shown in FIG. 2 showing the parts in assembled condition.
  • FIG. 4 is a fragmentary exploded view of a modified form of seal.
  • FIG. 5 is a fragmentary perspective view of the portion of the motor shown in FIG. 4, showing the parts in assembled condition.
  • the invention relates to submersible motors such as shown in FIG. 1 wherein a first frame or housing 10 comprising two halves which enclose the field stator 11 and rotor 12 on shaft 13, that may operate a pump impeller or the like.
  • the interior of housing 10 is preferably filled with oil and appropriate oil seals 14 are provided between the housing 10 and shaft 13.
  • a second housing 15 is removably mounted on housing 10 by screws 16.
  • Housing 15 has a cavity in which electrical connections are made between the leads from the motor housing 10 and a jacketed outlet cord 17 that is connected to a power source.
  • the cavity of second housing may include a pressure switch, not shown, to which connections are made from the motor winding and cord 17.
  • the housings 10, 15 are preferably made of a water and heat resistant dimensionally stable material such as powdered iron or a glass reinforced styrene modified polyphenylene oxide sold under the trademark NORYL.
  • housing 10 includes an open ended cylindrical cavity 20 in the periphery of the housing 10 in which the open end of the cavity 20 extends outwardly.
  • a body or seal 21 of resilient compressible elastomeric material is positioned in cavity 20.
  • the body is preferably made of acrylonitrilebutadiene rubber sold under the trademark BUNA N and having a shore durometer of 35 to 60 on the A scale so that it falls within the qualifications of soft rubber. Satisfactory results have been achieved with a rubber having a durometer of 50.
  • the body 21 has axial passages 22 through which the wires 18, 19 extend.
  • the second housing 15 includes an annular wall or projection 24 that extends axially inwardly against the body 21.
  • the body 21 includes a lower cylindrical portion 25 and preferably an upper frusto-conical portion 26.
  • the wires 18, 19 are unencased, that is they do not have a covering.
  • the wires 18 from the motor winding are coated, for example, with a modified polyester and nylon films, on the order of several thousandths of an inch in thickness such as conventionally found on film insulated copper or aluminum magnet wire used in the manufacture of electric motors.
  • the ground wire 19 can be bare or similarly film insulated but in any case is unencased.
  • the diameter of the cylindrical portion 25 is slightly less than the diameter of the cavity 20 so that the body 21 can be readily inserted in the cavity 20.
  • the diameter of the passages or openings 22 is slightly greater than the diameter of the unencased wires 18, 19, so that the wires 18, 19 can be readily inserted through passages 22.
  • the passages 22 preferably have a diameter between 100 and 130% of the diameter of the wires 18, 19.
  • wires 18, 19 are passed through an opening 27 inserted through passages 22 and the body 21 is placed in cavity 20.
  • the housing 15 is then brought into position adjacent housing 10 so that the tubular projection 24 extends into cavity 20.
  • the tubular projection 24 compresses the body 21 axially and radially to provide a seal between the periphery of the cavity 20 and the body 21 as well as between the wires 18, 19 and the body 21.
  • the diameter of the frusto-conical portion 26 at the base thereof is preferably greater than the internal diameter of the projection 24 so that a seal is also formed between the body 21 and the internal surface of projection 24.
  • the housings 10, 15 are in abutting contact.
  • the body 21' includes a second frusto-conical portion 26a which extends through opening 27.
  • the diameter of frusto-conical portion 26a at its base is greater than the diameter of opening 27 so that the body 21' is compressed at that point to enhance sealing between body 21' and the housing 10.

Abstract

A submersible motor comprising a first housing including a motor and a second housing enclosing electrical connections between the motor and a jacketed electrical cord to the second housing. The first housing has a cavity therein in the periphery thereof. A body of compressible resilient elastomeric material is positioned in the cavity and has an exterior configuration and dimensions which conform generally with the configuration and dimensions of the cavity. The body has a plurality of generally axial passages therein through which the magnet wires from the motor extend. The wires have a diameter so that they can be readily inserted through the passages in the body. The second housing has an annular wall extending axially through the open end of the cavity in the first housing and operable, when the second housing is in mounted position on the first housing, to compress the body radially into tight conformity with the wires from the motor.

Description

This invention relates to submersible motors and particularly to seals for submersible motors.
BACKGROUND AND SUMMARY OF THE INVENTION
In submersible electrical devices such as motors or pumps, it is sometimes necessary to bring the leads from the winding of the motor from a sealed oil filled cavity containing the motor to an adjacent isolated cavity wherein connections are made to an outlet cord and possibly a pressure switch.
Past efforts to meet the sealing requirements have largely centered around three basic approaches all workable but possessing disadvantages one of which being excessive costs. These current methods include (1) the use of the well known threaded compression screw to effect a seal to the outer diameter of the lead which is emerging from a threaded hole in the cavity, (2) the screwing down of a metal plate to compress a follower washer against a rubber ring seal which in turn compresses against the outer diameter of the lead and (3) the potting of an epoxy resin around the lead and bonding to the internal diameter of the hole in the cavity.
The costs involved in using threaded components is obvious and is amplified by the assembly of multiple parts. Another disadvantage is the excess of radially inward force due to the high mechanical advantage of the threads which sometimes create a thinning down of the lead insulation to the point where it becomes susceptable to mechanical abuse. Potting processes are at best inconvenient and often messy creating bottlenecks in high production assembly due to the need for application of heart and/or long cure times.
The present invention is intended to eliminate the aforementioned disadvantages by using unique and simple means for effecting a suitable seal where it is required to bring the motor leads from an oil filled cavity into an adjacent cavity for making electrical connections.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a part sectional elevational view of a submersible pump embodying the invention.
FIG. 2 is a fragmentary sectional exploded view on an enlarged scale of a portion of the motor in FIG. 1.
FIG. 3 is a fragmentary sectional view on an enlarged scale of the portion of the motor shown in FIG. 2 showing the parts in assembled condition.
FIG. 4 is a fragmentary exploded view of a modified form of seal.
FIG. 5 is a fragmentary perspective view of the portion of the motor shown in FIG. 4, showing the parts in assembled condition.
DESCRIPTION
Referring to FIG. 1, the invention relates to submersible motors such as shown in FIG. 1 wherein a first frame or housing 10 comprising two halves which enclose the field stator 11 and rotor 12 on shaft 13, that may operate a pump impeller or the like. The interior of housing 10 is preferably filled with oil and appropriate oil seals 14 are provided between the housing 10 and shaft 13.
A second housing 15 is removably mounted on housing 10 by screws 16. Housing 15 has a cavity in which electrical connections are made between the leads from the motor housing 10 and a jacketed outlet cord 17 that is connected to a power source. In addition, the cavity of second housing may include a pressure switch, not shown, to which connections are made from the motor winding and cord 17.
The housings 10, 15 are preferably made of a water and heat resistant dimensionally stable material such as powdered iron or a glass reinforced styrene modified polyphenylene oxide sold under the trademark NORYL.
It is necessary to provide a seal between the ground wire 19 and leads 18 extending from the motor winding 9 into the cavity of the housing 15.
Referring to FIGS. 2 and 3, housing 10 includes an open ended cylindrical cavity 20 in the periphery of the housing 10 in which the open end of the cavity 20 extends outwardly. A body or seal 21 of resilient compressible elastomeric material is positioned in cavity 20. The body is preferably made of acrylonitrilebutadiene rubber sold under the trademark BUNA N and having a shore durometer of 35 to 60 on the A scale so that it falls within the qualifications of soft rubber. Satisfactory results have been achieved with a rubber having a durometer of 50.
The body 21 has axial passages 22 through which the wires 18, 19 extend. The second housing 15 includes an annular wall or projection 24 that extends axially inwardly against the body 21. The body 21 includes a lower cylindrical portion 25 and preferably an upper frusto-conical portion 26. The wires 18, 19 are unencased, that is they do not have a covering. The wires 18 from the motor winding are coated, for example, with a modified polyester and nylon films, on the order of several thousandths of an inch in thickness such as conventionally found on film insulated copper or aluminum magnet wire used in the manufacture of electric motors. The ground wire 19 can be bare or similarly film insulated but in any case is unencased.
The diameter of the cylindrical portion 25 is slightly less than the diameter of the cavity 20 so that the body 21 can be readily inserted in the cavity 20. In addition the diameter of the passages or openings 22 is slightly greater than the diameter of the unencased wires 18, 19, so that the wires 18, 19 can be readily inserted through passages 22. The passages 22 preferably have a diameter between 100 and 130% of the diameter of the wires 18, 19.
Initially, wires 18, 19 are passed through an opening 27 inserted through passages 22 and the body 21 is placed in cavity 20.
The housing 15 is then brought into position adjacent housing 10 so that the tubular projection 24 extends into cavity 20. As screws 16 are tightened, the tubular projection 24 compresses the body 21 axially and radially to provide a seal between the periphery of the cavity 20 and the body 21 as well as between the wires 18, 19 and the body 21.
The diameter of the frusto-conical portion 26 at the base thereof is preferably greater than the internal diameter of the projection 24 so that a seal is also formed between the body 21 and the internal surface of projection 24.
In the final assembled position, the housings 10, 15 are in abutting contact.
In the modified form of the invention shown in FIGS. 4 and 5, the body 21' includes a second frusto-conical portion 26a which extends through opening 27. The diameter of frusto-conical portion 26a at its base is greater than the diameter of opening 27 so that the body 21' is compressed at that point to enhance sealing between body 21' and the housing 10.

Claims (2)

I claim:
1. In a submersible motor or the like, the combination comprising
a first housing containing a motor field stator having a field winding,
a second plastic housing mounted on said first housing,
said field having unencased field winding wires,
said first housing having an open ended cylindrical cavity therein in the periphery thereof with the open end of said cavity extending outwardly of said housing,
said first housing having an opening in the base of said cavity of lesser diameter than said cavity,
a cylindrical body of compressible elastomeric material positioned in said cavity,
said body being shaped such that it has a lower cylindrical portion and an upper frusto-conical portion which has a maximum diameter at the juncture with the cylindrical portion which is less than the diameter of the cylindrical portion,
said cylindrical portion of said body having a diameter which conforms with the diameter of the cavity so that said body can be readily inserted in said cavity without substantial compression and which is greater than the diameter of said opening in the base of said cavity,
said body having a plurality of generally axial passages therein,
said unencased wires from said field winding having a diameter such that they can be readily inserted through said passages when said body is radially uncompressed,
said second housing having a cylindrical tubular wall having a uniform thickness and an internal diameter less than the maximum diameter of said frusto-conical portion of said body,
said tubular wall extending axially into the open end of said cavity and has a radial end surface,
said frusto-conical portion having a greater diameter at its base than the internal diameter of said tubular wall,
and mounting means for mounting said second housing on said first housing and drawing said housing toward one another to force said tubular wall axially into said cavity and against said body to compress said body when said second housing is in mounted position on said first housing thereby compressing the cylindrical portion of said body radially outwardly into tight conformity with the periphery of the cavity and radially inwardly into tight conformity with the unencased wires from the motor and thereby also compressing the frusto-conical portion radially outwardly against the interior said said tubular wall into tight conformity therewith and radially inwardly into tight conformity with said unencase wires,
the part of said frusto-conical portion of said body radially inwardly of said tubular wall being unrestrained axially at one end of said body,
the part of said cylindrical body radially inwardly of said opening in said cavity being unrestrained axially.
2. The combination set forth in claim 1 wherein said body having a second frusto-conical portion extending downwardly,
said second frusto-conical portion extending through said opening in the base of said cavity,
said second frusto-conical portion having a greater diameter at its base than the diameter of the opening in the bottom wall of said cavity.
US05/747,064 1976-12-03 1976-12-03 Motor seals Expired - Lifetime US4104550A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0428749A1 (en) * 1989-05-24 1991-05-29 Fanuc Ltd. Structure of motor housing having integrally molded electric connector
US5304880A (en) * 1992-05-14 1994-04-19 Asmo Co., Ltd. Wire connection structure of electric rotating machinery
US5644171A (en) * 1994-07-28 1997-07-01 Hitachi, Ltd. Starter having an elastic seal member shaped to taper in a direction perpendicular to the longitudinal axis of the motor
US20090027147A1 (en) * 2007-07-24 2009-01-29 Denso Corporation Biaxial type of starter for starting internal combustion engine
US20110012451A1 (en) * 2008-03-11 2011-01-20 Harold Bitzer Electrical connection for an electric motor
US20110142697A1 (en) * 2009-12-14 2011-06-16 Pm S.R.L. Containment structure for an actuation unit for immersion pumps, particularly for compact immersion pumps to be immersed in wells
US20120133224A1 (en) * 2010-11-29 2012-05-31 Grosskopf Andrew P Arc resistant terminal block

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US965684A (en) * 1908-12-08 1910-07-26 Charles W Gerwig Connection and seal for the ends of electric cables.
US1844409A (en) * 1928-10-27 1932-02-09 Metropolitan Device Corp Joint
US2076261A (en) * 1933-05-11 1937-04-06 Jeffrey Mfg Co Electrical connecter
US2941025A (en) * 1957-11-07 1960-06-14 M & W Electric Mfg Co Inc Cable connectors for meter sockets having hubs
US3308316A (en) * 1964-02-05 1967-03-07 Emerson Electric Co Submersible motor with a sealed connector plug
US3555319A (en) * 1969-03-05 1971-01-12 Franklin Electric Co Inc Submersible electric motor
US3604964A (en) * 1970-05-20 1971-09-14 Red Jacket Mfg Co Submersible motor connector assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US965684A (en) * 1908-12-08 1910-07-26 Charles W Gerwig Connection and seal for the ends of electric cables.
US1844409A (en) * 1928-10-27 1932-02-09 Metropolitan Device Corp Joint
US2076261A (en) * 1933-05-11 1937-04-06 Jeffrey Mfg Co Electrical connecter
US2941025A (en) * 1957-11-07 1960-06-14 M & W Electric Mfg Co Inc Cable connectors for meter sockets having hubs
US3308316A (en) * 1964-02-05 1967-03-07 Emerson Electric Co Submersible motor with a sealed connector plug
US3555319A (en) * 1969-03-05 1971-01-12 Franklin Electric Co Inc Submersible electric motor
US3604964A (en) * 1970-05-20 1971-09-14 Red Jacket Mfg Co Submersible motor connector assembly

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0428749A1 (en) * 1989-05-24 1991-05-29 Fanuc Ltd. Structure of motor housing having integrally molded electric connector
EP0428749A4 (en) * 1989-05-24 1991-10-30 Fanuc Ltd. Structure of motor housing having integrally molded electric connector
US5126608A (en) * 1989-05-24 1992-06-30 Fanuc Ltd Motor housing with integrally molded electric connector
US5304880A (en) * 1992-05-14 1994-04-19 Asmo Co., Ltd. Wire connection structure of electric rotating machinery
US5644171A (en) * 1994-07-28 1997-07-01 Hitachi, Ltd. Starter having an elastic seal member shaped to taper in a direction perpendicular to the longitudinal axis of the motor
CN101354002B (en) * 2007-07-24 2012-10-31 株式会社电装 Biaxial type of starter for starting internal combustion engine
US20090027147A1 (en) * 2007-07-24 2009-01-29 Denso Corporation Biaxial type of starter for starting internal combustion engine
US8446025B2 (en) * 2007-07-24 2013-05-21 Denso Corporation Biaxial type of starter for starting internal combustion engine
US20110012451A1 (en) * 2008-03-11 2011-01-20 Harold Bitzer Electrical connection for an electric motor
US8400031B2 (en) * 2008-03-11 2013-03-19 Robert Bosch Gmbh Electrical connection for an electric motor
US20110142697A1 (en) * 2009-12-14 2011-06-16 Pm S.R.L. Containment structure for an actuation unit for immersion pumps, particularly for compact immersion pumps to be immersed in wells
US9353766B2 (en) * 2009-12-14 2016-05-31 Pm S.R.L. Containment structure for an actuation unit for immersion pumps, particularly for compact immersion pumps to be immersed in wells
US20120133224A1 (en) * 2010-11-29 2012-05-31 Grosskopf Andrew P Arc resistant terminal block

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AS Assignment

Owner name: UNIVERSAL ELECTRIC HOLDING COMPANY,OWOSSO,MI. A CO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNIVERSAL ELECTRIC COMPANY;REEL/FRAME:003903/0496

Effective date: 19810824

AS Assignment

Owner name: UNIVERSAL ELECTRIC COMPANY

Free format text: MERGER;ASSIGNOR:UNIVERSAL ELECTRIC COMPANY;REEL/FRAME:003944/0565

Effective date: 19810731

AS Assignment

Owner name: MAGNETEK, INC., A CORP OF DE.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNIVERSAL ELECTRIC COMPANY, A CORP OF DE.;REEL/FRAME:004656/0360

Effective date: 19861230